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Eclipsed Conformation

A : Dueto hig...

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A : Dueto higher electronegatuvity of N,O and F,the magnitude ofH bonding is quite appreciable in their hydrides.R: the boiling points ofNH3 h2O andHF are higher than the hydrides of he subsequent group members.

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Q. Assertion :Hydrides of

N, O

F

have lower boiling points than the hydrides of their subsequent group members. Reason: Boiling point depends upon the molecular mass only.

Q. Which of the following observations can be explained on the basis of hydrogen bonding?
(i)

H - F

has higher boiling point than other halogen acids.
(ii)

H_{2} O

has highest boiling point among hydrides of group 16 elements.
(iii)

N H_{3}

has lower boiling point than

P H_{3}

.

Polarity of a bond depends on the difference in the electronegativity of the bonded atoms. The higher the difference in the electronegativity, the higher will be the polarity of the bond.

The boiling point of

I C l

40^{\circ} C

B r_{2}

. This might be because :

Q. The hydrides of the first elements in groups 15 - 17, namely

N H_{3}, H_{2} O

H F

respectively, show abnormally high values for melting and boiling points. This is due to:

Q. The hydrides of the first element in group 15-17, namely

N H_{3}, H_{2} O

H F

, respectively show abnormally high values for melting and boiling points. This is due to:

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